In the past, I have written some basic "board" games like tetris,minesweeper, and tic-tac-toe in Tk. You can find the code for tetris at here. This page is a Tclet game, but also contains the Perl/Tk version. I have found that for games like that even my beginner Tk skills were adequate.

More recently, I became interested in doing simple 3D graphics in Tk. Even thouhg most low-level 2D support is existant within the canvas widget, when 3D applications are involved, the display slows down for even something as simple as a rotating cube. (Mind you, my 3D abilities are very rudimentary, and I am sure that optimization is in order). I would certainly be interested in playing around with what I have so far to see how much I can push Tk. I would be very interested to see what, if anything, you have achieved so far.